The purposes of this study are to investigate and analyze the supportability of the aboriginal high school students toward the preferential policy. In order to achieve the purposes, the researchers collect the data with questionnaire survey. The participants in this study are 604 aboriginal students who study in junior and senior high schools in Pingtung County. The research tool is a self-constructed questionnaire titled “The study of the supportability of aboriginal high school students toward preferential policy”. The valid sample data is analyzed with the SPSS for windows 12.0, under the procedures of percentage, and Chi-square test. According to the results of statistical analysis, the conclusions of this study are as follows: 1. Most aboriginal students agree with the preferential policy combined with Aboriginal Language Ability Certification (ALAC), and the way of extra points and extra admission of aboriginal students’numbers. 2. The aboriginal students have different opinions on the preferential policy toward the decreasing extra points of aboriginal students who have no ALAC gradually year by year, and the extra admission of aboriginal students’numbers limited to 2 percentage. 3. The preferential policy can promote the opportunity for the aboriginal students to attend school, as well as inspire their motivation to learning. 4. A pretty high percentage of the aboriginal students who enjoy preferential rights worry that their academic work may lag behind other students, as well as be inferior to other students. 5. Most aboriginal students expect that schools can arrange the guidance programs for their learning and living.